I currently have a 15-inch Retina MacBook Pro, that I'm considering selling. I'd like to hear MR's views on if the iPad 4 could replace its functionality. I am a college student, and I write papers, prepare presentations and do regular computer stuff. I don't do anything other than email, web browsing, calendar etc all of which seems to be able to be done via iPad 4. Anyone have any points I may have overlooked?